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Simplifying 166 = 2(x + 21) Reorder the terms: 166 = 2(21 + x) 166 = (21 * 2 + x * 2) 166 = (42 + 2x) Solving 166 = 42 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 166 + -2x = 42 + 2x + -2x Combine like terms: 2x + -2x = 0 166 + -2x = 42 + 0 166 + -2x = 42 Add '-166' to each side of the equation. 166 + -166 + -2x = 42 + -166 Combine like terms: 166 + -166 = 0 0 + -2x = 42 + -166 -2x = 42 + -166 Combine like terms: 42 + -166 = -124 -2x = -124 Divide each side by '-2'. x = 62 Simplifying x = 62
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